FIX: Error message when you try to edit a SQL Server Agent job or a maintenance plan by using SQL Server Management Studio in SQL Server 2005: "String or binary data would be truncated"
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Standard Edition, SQL Server 2005 Enterprise X64 Edition & SQL Server 2005 Enterprise Edition
Notification Contents: New and All Modifications
FIX: Error message when you try to edit a SQL Server Agent job or a maintenance plan by using SQL Server Management Studio in SQL Server 2005: "String or binary data would be truncated"
http://support.microsoft.com/kb/940269/en-US